The 600% was markup on landed goods...what a manufacturer pays their employees is essentially of no interest to the buyer. He views their products pays a price, including freight, then marks up when goods arrive. If an agent is involved the price he pays would cover commissions etc.
I agree manufacturing and production should be taking place locally (Australia in my case). But, like most developed countries we have legislation and laws to protect our workers...for example, minimum wages, occupational health and safety, supperannuation, worker's compensation...all boosts up the wages bill, so they source offshore. Fairness and equity doesn't come into it...just the reality of the bottom line and cold hard cash.
Yes, this is all pretty negative, yes it is an abuse of human rights, is it going to change? Probably not in our lifetime.